Lubricator.



No. 774,900. PATENTBD 110V. 15, 1904. G. WALCH.

N0 MODEL.

Apanying drawings, in which- UNITED STATES- Patented November 15, 1904.

PATENT OEEICE.

LUBRICATOR.

SPECIFICATION i Application filed April 8, 1904.

To all whom t may concern.-

Beitknown thatI,GUsTAvWALoH,manufac turer, a subject of the German Emperor, residing at Sedanplatz N o. 4,Wiesbaden, Germany, have invented certain new and useful Improvements in Lubricators, of which the following is a specification.

This invention relates `to lubricators in which grease is expressed from acup by means of a piston having a screw-threaded pist-onrod upon which is a nut driven by clockwork. In lubricators of this type the nut is liable to jam on the piston-rod, owing to one or the other being out of the axial line, and. it also often happens that when the piston has arrived at the end of its downward travel the pistonrod gets bent, owing to the continued lmovement of the clockwork.

The object of this invention is to remedy these defects and also to construct the lubri- Gator in such a manner that one piston-rod can be easily changed for another havinga screw of a different pitch for the purpose of altering the rate at which the grease is'e'xpressed by the piston.

The invention is illustrated in the accom- Figure l is a vertical section of a lubricator driven by a spring. Fig. 2 is a section of the piston and hollow shaft, showing the nut lifted from its seat. Fig. 3 is a plan of the nut and hollow shaft. Fig.4 is a side elevation of the hollow shaft and driving-wheel. Fig. 5 is a vertical section, and Fig. 6 is a plan, of a similar lubricator driven by a pendulum.

a is a grease-cup. a is a nozzle-piece screwed to the cup.

Z; is a piston formed, as shown in Figs. 1 and 2, of a pair of disks ZJ Z22, forming a recess within which is a disk c, pressed against the disk b2 by a spring If.

ba is a cup-leather.

c is a screw-threaded piston-rod fixed to the disk c.

c2 is a nut on the rod c,having wings c3, which fit The nut c2 therefore turns with the shaft, but is otherwise free to move relatively to it.

d is a toothed wheel fixed to the shaft CZ and into notches formed in a hollow shaft d. Y

forming the wheel driving the train of clockformng part of Letters Patent N o. 774,960, dated November 15, 1904.

Serial No. 202,211. (No model.)

work controlled in the usual way by an escapement. For the sake of clearness most of the train and the escapement are omitted from the drawings.

e is the mainspring, one end of which is fixed to the frame and the other end to the shaft d, which is driven by it. u

f is a key screwing onto the shaft CZ for winding up the clockwork and for maintain- 'ing the nut c2 in position.

g is a button fixed to the square head of the rod c and secured by a screw g. The button g serves to rotate the rod c by hand for returning the piston to the top of the cylinder.

l/Vhen the hollow shaft Z is rotated by the mainspring, it turns with it the nut c2, which forces the screw-threaded piston-rod c downward. The piston-rod c is normally prevented from turning by the friction between the disks c and Z22. When the piston has arrived at its lowest position, the rod c can, however, rotate without injuring itself, for the disk c can turn freely within the recess formed by the disks Then it is desired to change the piston-rod c for another rod having a screw-thread of different pitch, the nozzle-piece a and the -scre'w g are unscrewed. The button g and key f are then removed, the nut c2 is raised out of the hollow shaft Z by pushing the piston upward from below, and is then unscrewed by pushing downward out of the grease-cup a. The piston with its rod, is now removed and another piston, with a rod having a thread of a different pitch and provided with a corresponding nut, is substituted.

In place of driving the shaft CZ by a spring it may be driven by a pendulum actuated by the oscillation of some portion of the machine to be lubricated, as showh in Figs. 5 and 6. In these gures, /t is a pendulum pivoted at /z and carrying a driving-pawl 7b2, gearing with a ratchet-wheel j on the first motionshaft j'. /f is a spring pressing the pawl /LZ into gear, and It' is a retaining-pawl.

The object of connecting the nut c2 loosely to the shaft Z is as follows: The shaft must be allowed a certain play in its bearings in order that it may turn freely, and usually it is inconvenient to tix the driving-wheel CZ at IOO the middle ofthe length of the shaft, and the thrust, therefore, of the driving-wheel tends to force the shaft out of line. The piston also is liable to get out of center, owing to the cup-leather being thicker or harder on one side than the other. If, therefore, the nut is rigidly connected to the driving-wheel or shaft, it is liable to be jammed on the rod and prevent the working of the apparatus.

What I claim isl. The combination of a piston, a screwthreaded piston-rod connected to it, a shaft, means for driving the shaft, and a nut on the rod turning with the shaft but free to move relatively to it.

Q. The combination of a piston, a screwthreaded piston-rod connected to it, a hollow shaft having slots in it surrounding the rod, means for driving the shaft, and a nut on the rd provided with wings engaging with the s ots.

3. The combination of a piston, a screwthreaded piston-rod frictionally connected to it, a shaft, means for driving the shaft, and a nut on the rod turning with the shaft but free to move relatively to it.

4. The combination of a piston, a screwthreaded piston-rod frictionally connected to it, a hollow shaft having slots in it surrounding the rod, means for driving the shaft, and a nut on the rodprovided with wings engaging with the slots.

5. rIhe combination of a piston, a screwthreaded piston-rod, a disk fixed to the rod, a spring pressing the piston and disk together, a nut on the rod an'd means for rotating the nut.

6. The combination of a piston, a screwthreaded piston-rod, a disk fixed to the rod,.

a spring pressing the piston and disk together, a hollow rod having slots in it surrounding the rod, means for driving the shaft, and a nut on the rod provided with wings engaging with the slots.

GUSTAV WALCH. Witnesses:

LOUIS KEHRMANN, WM. A. FLAITH. 

